{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317AEMP","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317AEMP","canonicalUrl":"https://icboms.com/texas-instruments/LM317AEMP","factsUrl":"https://icboms.com/api/mcp/products/LM317AEMP","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317AEMP, adjustable positive voltage regulator, 1.5 A output, 40 V input max, 1.25 V to 37 V output range, PSRR 80 dB ~ 65 dB at 120 Hz, SOT-223-4 surface mount, -40°C to 125°C.","salesMarkdown":"## What this LM317AEMP does on a board — and in the field kit The LM317AEMP is a classic three-terminal adjustable positive voltage regulator from Texas Instruments, delivering up to 1.5 A output with an input range up to 40 V and an adjustable output from 1.25 V to 37 V. It is the surface-mount SOT-223-4 version of the industry-standard LM317 family — the same reliable adjustable regulator in a package you can hand-solder on site with a fine-tip iron. ## 1.5 A output and PSRR — what they mean for a swap At 1.5 A continuous output, this regulator covers the majority of on-board local rails — sensor supplies, small relay coils, logic and analog bias lines — without the bulk of a TO-220. The PSRR of 80 dB at 120 Hz dropping to 65 dB at higher frequencies means it cleans up rectified line ripple well enough that a field-swapped regulator on a noisy input rail still holds the output steady within a few millivolts. ## SOT-223-4: hand-solderable, no hot-air station needed Orientation is obvious from the chamfered edge. A field tech can swap it with tweezers and a fine-tip iron; the tab needs a good solder fillet to the board pad for thermal relief, but no hot-air station is required. ## Last Buy — the sourcing window is closing Texas Instruments lists the LM317AEMP as Last Buy. That means the factory order window is open now but will close — no further production runs after the LTB date. For a field-repair or MRO inventory, this is the time to buy the lifetime quantity or qualify a drop-in replacement. ## Protection features and operating range Built-in over-current, over-temperature, and short-circuit protection mean this regulator handles a momentary output short without letting the magic smoke out — a real advantage when swapping on a live-ish board.","metaTitle":"LM317AEMP adjustable voltage regulator, 1.5 A, SOT-223-4","metaDescription":"LM317AEMP adjustable positive regulator, 1.5 A output, 40 V input max, 1.25 V to 37 V output, PSRR 80 dB ~ 65 dB at 120 Hz. SOT-223-4 surface mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","Product Status":"Last Time Buy","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"SOT-223-4","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.0600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/173f3d20b70e5ad47e70de74c614263c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317AEMP/alternatives.json"},"ai":{"faq":[{"question":"Is LM317AEMP obsolete or last time buy?","answer":"The factory order window is active but closing — no further production runs after the LTB date. For a field-repair or MRO inventory, buy the lifetime quantity now or qualify a drop-in replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317AEMP","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317AEMP when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}